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(organic chemistry)
(C6H5)2 AsCl Colorless crystals used during World War I as an antipersonnel device to generate a smoke causing sneezing and vomiting.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



diphenylarsenyl chloride, (C6H5)2AsCl; colorless crystals. Melting point, ~38°C; boiling point, 333°C; density, 1.3870 g/cm3 (42°C); index of refraction nD56, 1.6332. It is insoluble in water but readily soluble in most organic solvents. It reacts readily with water and alkalies and oxidizes rather readily. It is made by reducing diphenylarsenic acid, (C6H5)2AsO(OH), with sulfur dioxide in concentrated hydrochloric acid.

In the form of smoke or vapor, diphenylchloroarsine irritates the upper respiratory passages, causing uncontrollable sneezing and coughing (unendurable concentration, 1 mg/m3). During World War I it was extensively used by Germany as a poison under the code name Klark I.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.